Frequencies for first 10,000 rows of clintype variable in nhamcsopd2003 dataset :

       type of clinic |      Freq.     Percent        Cum.
----------------------+-----------------------------------
     general medicine |      3,937       39.37       39.37
              surgery |      1,686       16.86       56.23
           pediatrics |      1,328       13.28       69.51
obstetrics/gynecology |      1,245       12.45       81.96
      substance abuse |        345        3.45       85.41
                other |      1,459       14.59      100.00
----------------------+-----------------------------------
                Total |     10,000      100.00

by Jean Roth , jroth@nber.org , 28 Mar 2016